I tried to install again Akelpad after having put your command and there are no longer error during install but at the end notepad is openning with a msgbox "Le chemin d'accès est introuvable" (the pathfile is unknown)

not working for you, because you have prompt "(O/N)", but command send "echo y". You changed command to "echo o" and it start to work. I updated installer to use icacls.exe, if possible. Can you try to install it? If any error happens post a screenshot.

not working for you, because you have prompt "(O/N)", but command send "echo y". You changed command to "echo o" and it start to work. I updated installer to use icacls.exe, if possible. Can you try to install it? If any error happens post a screenshot.

Exactly ! (Oui = Yes)
I try it right now

EDIT :

So, the install performed without any warning or error, however it runs automatically notepad showing "The specified pathfile is unknown"